2007A&A...467..229P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST18:37:59

2007A&A...467..229P - Astronomy and Astrophysics, volume 467, 229-235 (2007/5-3)

Long-term photometric study of FK Comae Berenices and HD 199178.

PANOV K. and DIMITROV D.

Abstract (from CDS):

The rapidly rotating active stars FK Com and HD 199178 are investigated using extensive long-term photometry. The data set includes previously unpublished photometry, obtained at the Rozhen National Astronomical Observatory. We look for periodicities in the long-term photometric behaviour of both stars, as well as for spots, using light curve modelling. Special attention is paid to the behaviour of the ``flip-flop'' phenomenon. Light curves in UBV of FK Com and HD 199178 are used to construct an O-C diagram for each star, and they are modelled to obtain spot distribution. The main result for FK Com is that the ``flip-flop'' phenomenon is a superposition of an oscillating process of activity and real and fast ``flip-flops''. For the oscillating component, we obtained a cycle of 5.8-years. The same cycle is also present in other photometric characteristics. The O-C diagram for HD 199178 shows a cycle of 4.2-years. Modelling of the light curves of both stars reveals a large high-latitude spot on each star and also smaller spots in the equatorial belt or at intermediate latitudes.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: individual: FK Comae Berenices - stars: individual: HD 199178 - stars: starspots

VizieR on-line data: <Available at CDS (J/A+A/467/229): table2a.dat table2b.dat table3a.dat table3b.dat table5a.dat table5b.dat>

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* FK Com Ro* 13 30 46.7993742986 +24 13 57.786184235   9.04 8.245   7.204 G4III 345 1
2 HD 117567 * 13 30 52.2102597150 +24 14 15.415103714 8.000 8.050 7.620     F2 51 0
3 HD 117876 PM* 13 32 48.21379 +24 20 48.2809   7.03   5.5   G8II-III 113 1
4 HD 199178 Ro* 20 53 53.6522297846 +44 23 11.078229740   7.98 7.24     G5III-IV 196 1
5 HD 199206 * 20 54 05.9380735439 +45 06 36.529099207 7.07 7.31 7.33     B8II 25 1
6 HD 199312 * 20 54 45.29826 +45 08 10.5966 7.07 7.52 7.59     A0V 22 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-18:37:59

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